Q.8 A child staying in a coastal region test the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you ex¬plain the reason?

The seawater contains a large amount of salts and ions in comparison to drinking water.

These salts and ions can easily conduct electricity and thus seawater is a better conductor of electricity and produces a stronger magnetic field in the wire.

Hence when he tested both seawater and drinking water with his tester then the compass needle shows more deflection in the case of seawater.